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When you create an encrypted form, this popup window will appear for you to download or upload the key for you encrypted form. This key will be used to view your form's encrypted submission data.
For more information about encrypted form, you can check this article: What are Encrypted Forms and how to use them as expert.
Have you misplaced the downloaded key of your encrypted form or you were not able to see the popup so you were unable to download the key?
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